84
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
Troubleshooting guide
Table 84-1:
Troubleshooting guide (continued)
Filling issues
Issue
Possible causes
Actions
Unit does not fill with water . • Malfunctioning fill valve
• Unplug probe head . Fill valve should open . If fill valve does not
open, verify proper 24 VAC to fill valve . If voltage is present and
valve does not open, replace valve or valve coil .
• Verify that coil is 24 VAC .
• Verify that valve stem moves freely .
• No water supply to fill valve
• Check if water supply line strainer is plugged .
• Verify that manual water line shut-off valve is open and that
pressure exists .
• Check that in-line needle valve is open .
• Unit is not in Auto Mode
• Change mode to Auto .
• Vapor-logic control is in end-of-season
drain mode
• Check for humidification demand signal at control board .
• Inlet water needle valve is closed
• Check needle valve .
• Unit is in freeze protection draining
• Change mode to Auto .
• Fill valve stuck in closed position
• Recycle power to recycle fill valve closing and opening .
• Malfunctioning level control system
• See below .
Fill valve does not close
• Open drain valve
• If automatic drain valve is locked in the manual open position,
reset to automatic .
• Replace valve if there is a broken return spring on the drain valve .
• Clean or replace drain valve if an obstruction in the valve does not
allow complete closure .
• Close manual drain valve if it is open .
• If Vapor-logic shorted output to fill valve coil, replace board or
drain coil .
• Malfunctioning level control system
• Check that probe plug is plugged in fully .
• If needed, clean probe rods or replace .
• Replace board if Vapor-logic control board is defective .
• Verify that system is in auto mode .
• Verify that probe is wired correctly .
• Fill valve is stuck
• Check if fill valve is installed backwards . If yes, repipe .
• If there is a faulty internal spring or diaphragm in the fill valve,
replace valve .
• Check if there is an obstruction that does not allow valve to seat
properly . Clean or replace valve as needed .
• Check for control voltage across fill valve coil . (Check wiring and
controls .)
• Install water inlet shock arrestor .
Continued
TROUBLESHOOTING
